git-remote-mediawiki: no need to update private ref in non-dumb push

We used to update the private ref ourselves, but this update is now
done by default since 664059fb (transport-helper: update remote
helper namespace, 2013-04-17).

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/mw-to-git/git-remote-mediawiki.perl

@@ -1214,7 +1214,6 @@ sub mw_push_revision {
 		}
 		if (!$dumb_push) {
 			run_git(qq(notes --ref=${remotename}/mediawiki add -f -m "mediawiki_revision: ${mw_revision}" ${sha1_commit}));
-			run_git(qq(update-ref -m "Git-MediaWiki push" refs/mediawiki/${remotename}/master ${sha1_commit} ${sha1_child}));
 		}
 	}